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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e44522a3a38745f95410c670a04a5ec9b9a59518ef2a72d3cbdda5e2c8e29a' 
  AND token = 'SibOFd9n6562m+TMCjgpyvN1J09j/eFYO4A5W6CnEUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}